when water
121water supplies — In the Stone Age, when people first began settling on the alluvial plains of Mesopotamia, perhaps their single most immediate concern was finding reliable sources of freshwater for drinking and watering their crops and animals. At first, the… …
122Water tower — A water tower, watershed, or elevated water tower is a large elevated water storage container. The term tower speaks to its elevation and is constructed for the purpose of holding a supply of water at a height sufficient to pressurize a water… …
123Water clock — For the individual water clock at The Children s Museum of Indianapolis, see Water clock (Indianapolis). A display of two outflow water clocks from the Ancient Agora Museum in Athens. The top is an original from the late 5th century BC. The… …
124Water hyacinth — taxobox name = Water Hyacinth image caption = Common Water Hyacinth ( E. crassipes ) regnum = Plantae unranked divisio = Angiosperms unranked classis = Monocots unranked ordo = Commelinids ordo = Commelinales familia = Pontederiaceae genus =… …
125Water memory — Memory of water redirects here. For the Spanish Argentine film, see Memory of Water (film). Water memory Claims Under certain circumstances water can retain a memory of solute particles after arbitrarily large dilution. Related scientific… …
126Water speed record — The World Unlimited water speed record is the officially recognised fastest speed achieved by a water borne vehicle. The current record of 511 km/h (317 mph) was achieved in 1978. * From 1909 to 1927 the record was an unofficial listing from the… …
127Water rocket — A water rocket is a type of model rocket using water as its reaction mass. The pressure vessel mdash;the engine of the rocket mdash;is usually a used plastic soft drink bottle. The water is forced out by a pressurized gas, typically compressed… …
128Water softening — A water softener reduces the dissolved calcium, magnesium, and to some degree manganese and ferrous iron ion concentration in hard water.These hardness ions cause three major kinds of undesired effects. Most visibly, metal ions react with soaps… …
